var dateFormat = function () {  
    var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,  
        timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,  
        timezoneClip = /[^-+\dA-Z]/g,  
        pad = function (val, len) {  
            val = String(val);  
            len = len || 2;  
            while (val.length < len) val = "0" + val;  
            return val;  
        };  
  
    // Regexes and supporting functions are cached through closure  
    return function (date, mask, utc) {  
        var dF = dateFormat;  
  
        // You can't provide utc if you skip other args (use the "UTC:" mask prefix)  
        if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {  
            mask = date;  
            date = undefined;  
        }  
  
        // Passing date through Date applies Date.parse, if necessary  
        date = date ? new Date(date) : new Date();  
        if (isNaN(date)) throw SyntaxError("invalid date");  
  
        mask = String(dF.masks[mask] || mask || dF.masks["default"]);  
  
        // Allow setting the utc argument via the mask  
        if (mask.slice(0, 4) == "UTC:") {  
            mask = mask.slice(4);  
            utc = true;  
        }  
  
        var _ = utc ? "getUTC" : "get",  
            d = date[_ + "Date"](),  
            D = date[_ + "Day"](),  
            m = date[_ + "Month"](),  
            y = date[_ + "FullYear"](),  
            H = date[_ + "Hours"](),  
            M = date[_ + "Minutes"](),  
            s = date[_ + "Seconds"](),  
            L = date[_ + "Milliseconds"](),  
            o = utc ? 0 : date.getTimezoneOffset(),  
            flags = {  
                d:    d,  
                dd:   pad(d),  
                ddd:  dF.i18n.dayNames[D],  
                dddd: dF.i18n.dayNames[D + 7],  
                m:    m + 1,  
                mm:   pad(m + 1),  
                mmm:  dF.i18n.monthNames[m],  
                mmmm: dF.i18n.monthNames[m + 12],  
                yy:   String(y).slice(2),  
                yyyy: y,  
                h:    H % 12 || 12,  
                hh:   pad(H % 12 || 12),  
                H:    H,  
                HH:   pad(H),  
                M:    M,  
                MM:   pad(M),  
                s:    s,  
                ss:   pad(s),  
                l:    pad(L, 3),  
                L:    pad(L > 99 ? Math.round(L / 10) : L),  
                t:    H < 12 ? "a"  : "p",  
                tt:   H < 12 ? "am" : "pm",  
                T:    H < 12 ? "A"  : "P",  
                TT:   H < 12 ? "AM" : "PM",  
                Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),  
                o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),  
                S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]  
            };  
  
        return mask.replace(token, function ($0) {  
            return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);  
        });  
    };  
}();  
  
// Some common format strings  
dateFormat.masks = {  
    "default":      "ddd mmm dd yyyy HH:MM:ss",  
    shortDate:      "m/d/yy",  
    mediumDate:     "mmm d, yyyy",  
    longDate:       "mmmm d, yyyy",  
    fullDate:       "dddd, mmmm d, yyyy",  
    shortTime:      "h:MM TT",  
    mediumTime:     "h:MM:ss TT",  
    longTime:       "h:MM:ss TT Z",  
    isoDate:        "yyyy-mm-dd",  
    isoTime:        "HH:MM:ss",  
    isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",  
    isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"  
};  
  
// Internationalization strings  
dateFormat.i18n = {  
    dayNames: [  
        "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",  
        "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"  
    ],  
    monthNames: [  
        "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",  
        "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"  
    ]  
};  
  
// For convenience...  
Date.prototype.format = function (mask, utc) {  
    return dateFormat(this, mask, utc);  
};